JOHN TIERNEY ON JET-SETTING ENVIRONMENTALISTS: “I’ve given Brad Pitt and Al Gore grief about their carbon footprints. But it’s clear from a study in England that celebrities aren’t the only greens with a fondness for jet travel. . . . So are the green habits at home doing such a good job of mitigating guilt that they’re interfering with more realistic strategies to cut greenhouse emissions? If so, to me that’s one more argument against recycling.”